Capacitively-coupled RFID encoder
First Claim
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1. A capacitive RFID tag encoder, comprising:
- a substrate;
a ground plane on a first surface of the substrate;
a first plurality of serially-connected stripline conductors on a second surface of the substrate, the serially-connected stripline conductors in the first plurality being arranged within a first area of the second surface, a second plurality of serially-connected stripline conductors on the second surface of the substrate, the serially-connected stripline conductors in the second plurality being arranged within a second area of the second surface, the encoder being configured to drive the first plurality of serially-connected stripline conductors with an RF signal and to drive the second plurality of serially-connected stripline conductors with a phase-shifted version of the RF signal.
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Abstract
In one embodiment, a capacitive encoding system is provided that includes a pair of capacitive elements formed from an arrangement of stripline conductors.
12 Citations
11 Claims
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1. A capacitive RFID tag encoder, comprising:
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a substrate;
a ground plane on a first surface of the substrate;
a first plurality of serially-connected stripline conductors on a second surface of the substrate, the serially-connected stripline conductors in the first plurality being arranged within a first area of the second surface, a second plurality of serially-connected stripline conductors on the second surface of the substrate, the serially-connected stripline conductors in the second plurality being arranged within a second area of the second surface, the encoder being configured to drive the first plurality of serially-connected stripline conductors with an RF signal and to drive the second plurality of serially-connected stripline conductors with a phase-shifted version of the RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A capacitive RFID tag encoder, comprising:
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a substrate; and
a plurality of capacitive elements on the substrate, each capacitive element including a plurality of serially-connected stripline conductors, the encoder being configured to drive a first selected one of the capacitive elements with an RF signal and to drive a second selected one of the capacitive elements with a phase-shifted version of the RF signal. - View Dependent Claims (9, 10, 11)
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Specification